CN105490694A - Device for positioning cable blind pit - Google Patents

Device for positioning cable blind pit Download PDF

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Publication number
CN105490694A
CN105490694A CN201610028400.2A CN201610028400A CN105490694A CN 105490694 A CN105490694 A CN 105490694A CN 201610028400 A CN201610028400 A CN 201610028400A CN 105490694 A CN105490694 A CN 105490694A
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CN
China
Prior art keywords
signal
unit
processing unit
digital information
sent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201610028400.2A
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Chinese (zh)
Other versions
CN105490694B (en
Inventor
江舒信
郁建飞
应正翔
马蔡国
李灏波
郑方伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HANGZHOU KAIDA ELECTRIC POWER CONSTRUCTION Co Ltd
State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
HANGZHOU KAIDA ELECTRIC POWER CONSTRUCTION Co Ltd
State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HANGZHOU KAIDA ELECTRIC POWER CONSTRUCTION Co Ltd, State Grid Corp of China SGCC, State Grid Zhejiang Electric Power Co Ltd, Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd filed Critical HANGZHOU KAIDA ELECTRIC POWER CONSTRUCTION Co Ltd
Priority to CN201610028400.2A priority Critical patent/CN105490694B/en
Publication of CN105490694A publication Critical patent/CN105490694A/en
Application granted granted Critical
Publication of CN105490694B publication Critical patent/CN105490694B/en
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • GPHYSICS
    • G08SIGNALLING
    • G08CTRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02Services making use of location information
    • H04W4/025Services making use of location information using location based information parameters

Abstract

The invention provides a device for positioning a cable blind pit. The device comprises a signal transmitting device and a signal receiving device. The transmitting antenna of the signal transmitting device is connected with a signal source generating device and is used for wirelessly transmitting signals which are generated by the signal source generating device. The signal receiving device comprises a receiving antenna, a processing device and a display device. The processing device is connected with the receiving antenna and the display device and is used for processing the signal which is received by the receiving antenna for obtaining digital information and outputting the digital information to the display device. The digital information is used for positioning the cable blind pit through representing the strength of the signal. Obviously, after the signal receiving device receives the signal which is transmitted by the signal receiving device, the digital information can be obtained through processing the signal; and the cable blind pit can be accurately positioned through the digital information, thereby preventing waste of manpower and time and reducing economic loss.

Description

A kind of device of cable staple shaft location
Technical field
The invention belongs to power domain, in particular, relate to the device of a kind of cable staple shaft location.
Background technology
In power construction, cabling is absolutely necessary one of work.Cable is generally laid in the cable duct in the cable trough of underground.For the ease of the maintenance after construction and construction and maintenance, cable duct arranges a cable work well every a segment distance, and the general width of cable work well and the degree of depth are all greater than cable trough, and there is well lid on ground.
With reference to Fig. 1, along with the development of urban construction, due to the planning in plot, city, the reason such as expansion transition, municipal administration greening, construction of road, phenomenon is buried in covering to cause the well location of a lot of original cable work well to occur, is referred to as cable staple shaft.And cable staple shaft does not often all have to mark, for follow-up cable construction adds very high difficulty on design and construction drawing or the prospecting data in early stage accurately.
If promptly and accurately cable staple shaft cannot be found out, gently then again excavate, cause manpower, the expending of time, incur loss through delay project progress; Heavy then cause cabling to carry out pumpback, do over again, cause huge economic loss.
Summary of the invention
In view of this, the invention provides the device of a kind of cable staple shaft location, so that find out cable staple shaft accurately, avoid manpower, waste of time, reduce economic loss.
The invention provides the device of a kind of cable staple shaft location, comprising: sender unit and signal receiving device;
Described sender unit comprises: signal source generating means and transmitting antenna;
Described transmitting antenna is connected with described signal source generating means, for making the signal wirelessly sending the generation of described signal source generating means;
Described signal receiving device comprises: reception antenna, processing unit and display unit;
Described processing unit is connected with described reception antenna and described display unit respectively, obtains digital information, and output to described display unit for the treatment of after the described signal that described reception antenna receives; Described digital information is used for the position being carried out positioning cable staple shaft by the intensity characterizing described signal.
Preferably, described signal source generating means specifically comprises: signal generation unit, signal processing unit and signal madulation unit;
Described signal generation unit is connected with described signal processing unit, for generating Sine Wave Pulse Width Modulation SPWM signal and being sent to described signal processing unit;
Described signal processing unit is connected with described signal madulation unit, for described SPWM signal being adjusted to the standard sine signal of fixed frequency, and is sent to described signal madulation unit;
Described signal madulation unit is connected with described transmitting antenna, after being modulated by described standard sine signal, send the standard sine signal after modulation by described transmitting antenna.
Preferably, described processing unit specifically comprises: signal demodulation unit, signal computing unit;
Described signal demodulation unit is connected with described reception antenna, carries out rectification, generating solution modulation signal for the standard sine signal after the described modulation that received by described reception antenna;
Described signal computing unit is connected with described signal demodulation unit, obtains digital information, and described digital information is sent to described display unit for carrying out computing to described rectification signal.
Preferably, also audio output device is comprised;
Described audio signal also for described signal being converted to the audio signal of the intensity for characterizing described signal, and is sent to described audio output device by described processing unit;
Described audio output device is connected with described processing unit, for exporting described audio signal.
Preferably, light output device is also comprised;
Described light signal also for described signal being converted to the light signal of the intensity for characterizing described signal, and is sent to described light output device by described processing unit;
Described light output device is connected with described processing unit, for exporting described light signal.
Preferably, the shell of described sender unit is cylindrical or oval water-proof sealing shell.
Preferably, the sheathing material of described sender unit is metal.
Preferably, the supply unit of described sender unit is detachable chargeable lithium cell.
Preferably, the supply unit of described signal receiving device is detachable chargeable lithium cell.
Can find out according to technique scheme, the invention provides the device of a kind of cable staple shaft location, comprising: sender unit and signal receiving device; Described sender unit comprises: signal source generating means and transmitting antenna; Described transmitting antenna is connected with described signal source generating means, for making the signal wirelessly sending the generation of described signal source generating means; Described signal receiving device comprises: reception antenna, processing unit and display unit; Described processing unit is connected with described reception antenna and described display unit respectively, obtains digital information, and output to described display unit for the treatment of after the described signal that described reception antenna receives; Described digital information is used for the position being carried out positioning cable staple shaft by the intensity characterizing described signal.Visible, after signal receiving device receives the signal of sender unit transmission, carrying out process to signal can obtain digital information, just accurately can locate the position of cable staple shaft according to digital information, avoid manpower and waste of time, decrease economic loss.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the present invention's application scenarios schematic diagram of the prior art;
A kind of structural representation of the device of a kind of cable staple shaft location that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is an embody rule scene schematic diagram in the embodiment of the present invention;
The another kind of structural representation of the device of a kind of cable staple shaft location that Fig. 4 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The device schematic diagram of a kind of cable staple shaft location that Fig. 2 provides for the embodiment of the present invention.
With reference to shown in Fig. 2, the device of a kind of cable staple shaft location provided by the invention, comprising:
Sender unit 100 and signal receiving device 200;
In work progress, cabling uses wiring machine, from known cable work well cable duct, stretches in cable duct, carry out cable laying by the dredging bars of wiring machine.In the embodiment of the present invention, sender unit 100 is arranged on the front end of wiring machine dredging bars, works not affecting under the prerequisite that dredging bars normally uses.
Described sender unit 100 comprises: signal source generating means 102 and transmitting antenna 101;
Described transmitting antenna 101 is connected with described signal source generating means 102, for making the signal wirelessly sending the generation of described signal source generating means;
In the embodiment of the present invention, sender unit 100 comprises signal source generating means, signal source generating means for generation of the signal of fixed frequency, for the particular location of framing signal dispensing device.Sender unit 100 also comprises transmitting antenna 101, and transmitting antenna 101 is external antennas, wirelessly carries out data communication with the reception antenna in signal receiving device for making.
Described signal receiving device 200 comprises: reception antenna 201, processing unit 202 and display unit 2003;
Described processing unit 202 is connected with described reception antenna 201 and described display unit 203 respectively, obtains digital information, and output to described display unit for the treatment of after the described signal that described reception antenna receives; Described digital information is used for the position being carried out positioning cable staple shaft by the intensity characterizing described signal.
In the embodiment of the present invention, the reception antenna 201 in signal receiving device 202 receives the signal sent by transmitting antenna, and passes the signal in processing unit and carry out data processing.After data process by processing unit 202, obtain representing that digital information is sent in display unit 203 by the digital information of signal strength signal intensity and show, digital information shows by display unit 203.Workmen judges the power of signal according to the digital information shown in display unit, and the particular location of accurate positioning cable staple shaft.
Preferably, also comprise audio output device, described audio signal also for described signal being converted to the audio signal of the intensity for characterizing described signal, and is sent to described audio output device by described processing unit 202; Described audio output device is connected with described processing unit 202, for exporting described audio signal.
In actual use, in display unit 203, the digital information of display can comprise the display of signal voltage value, signal code value and signal power, and signal power can be divided into five grades, uses the mode of lattice number in a display device, one lattice represent the most weak, and five lattice represent the strongest.
In order to make positioning result more accurate, signal is also converted to audio signal by processing unit 202, when audio signal is rapid, represent that the intensity of signal is large, otherwise, then represent that signal is more weak, the mode using audio frequency and digital information to combine, can judge the particular location of cable staple shaft more accurately.
Preferably, light output device is also comprised;
Described light signal also for described signal being converted to the light signal of the intensity for characterizing described signal, and is sent to described light output device by described processing unit;
Described light output device is connected with described processing unit, for exporting described light signal.
Further, in order to make output display more directly perceived, also include light output device, processor converts the signal into and represents the light signal of signal strength signal intensity, carrys out the power of display intuitively in light output device in the mode of flicker or changes colour.
Shown in Figure 3, in actual use, in time there is cable staple shaft in work progress, sender unit 100 can be tortuous in cable staple shaft together along with the dredging bars of wiring machine, now, although wiring machine works on, but, because sender unit is in the cable staple shaft, so when workmen on road surface along when in drawing, the direction of cable duct is moved, the signal in signal receiving device will die down, now, workmen confirms along different orientation from here, finally can determine the particular location of cable staple shaft accurately.Therefore, workmen is strong and weak according to the signal of display in signal receiving device 200, just can realize the location of cable staple shaft.
Can find out, in the embodiment of the present invention, after signal receiving device receives the signal of sender unit transmission, process is carried out to signal and can obtain digital information, just accurately can locate the position of cable staple shaft according to digital information, avoid manpower and waste of time, decrease economic loss.
The another kind of structural representation of the device of a kind of cable staple shaft location that Fig. 4 provides for the embodiment of the present invention.
With reference to Fig. 4, the device of a kind of cable staple shaft location provided by the invention comprises:
Sender unit 100, signal source generating means 102, transmitting antenna 101, signal receiving device 200, reception antenna 201, processing unit 202, display unit 203.
Described signal source generating means 102 specifically comprises: signal generation unit 1023, signal processing unit 1022 and signal madulation unit 1021;
Described signal generation unit 1023 is connected with described signal processing unit 1022, for generating Sine Wave Pulse Width Modulation SPWM signal and being sent to described signal processing unit 1022;
In the embodiment of the present invention, signal generation unit 1023 is the MCU of high speed ARM kernel, and it produces the SPWM signal of a fixed frequency, and signal generation unit 1023 preferably adopts model to be the microcontroller of ATmega16L.ATmega16L is 8 high-performance, low-power consumption microcontroller, the peripheral hardware resource that built-in 16KFLASH memory, non-volatile EEPROM, JTAG online programming emulation interface, IIC, SPI, 10 AD, PWM etc. enrich, is applicable to the industrial low-power consumption application scenario of high reliability and anti-interference requirement.51 general processors exist that programming simulation is loaded down with trivial details, the other expanded circuit of the less need of peripheral hardware, needleless to defects such as low-power consumption occasion particular design, therefore preferably adopt ATmega16L microcontroller.
Described signal processing unit 1022 is connected with described signal madulation unit 1021, for described SPWM signal being adjusted to the standard sine signal of fixed frequency, and is sent to described signal madulation unit 1021; Described signal madulation unit 1021 is connected with described transmitting antenna, after being modulated by described standard sine signal, send the standard sine signal after modulation by described transmitting antenna.
SPWM signal produces the standard sine signal of a fixed frequency by signal processing unit 1022, standard sine signal is by signal madulation unit 1021, signal madulation unit 1021 is through high-power amplifying circuit (not shown), sent by transmitting antenna 101, the operating frequency of modulation signal, at more than 100MHz, has good penetrability.
Signal processing unit 1022 preferably adopts the chip of AD9835, it has the features such as frequency resolution is high, stability is high, volume is little, low-power consumption, frequency of signal generator traditional by contrast adopts multiple phase-locked loop to form, circuit is complicated, expensive, and signal is long for settling time, dynamic characteristic is poor.
The signal frequency of the sender unit in the embodiment of the present invention is stablized, the interference of other frequency band signals can be avoided, and the penetrance of signal is strong, transmits and can penetrate pvc pipe, pipe of cement 3-4 rice earthing, the reinforced concrete cover plate 1-2 rice earthing of 1.5*0.5*0.15.
Described processing unit 202 specifically comprises: signal demodulation unit 2021, signal computing unit 2022;
Described signal demodulation unit 2021 is connected with described reception antenna 201, carries out rectification, generating solution modulation signal for the standard sine signal after the described modulation that received by described reception antenna 201;
Described signal computing unit 2022 is connected with described signal demodulation unit 2021, obtains digital information, and described digital information is sent to described display unit 203 for carrying out computing to described rectification signal.
In the embodiment of the present invention, the rectification signal that signal demodulation unit 2021 rectification generates is sampled by the high-speed AD in arithmetic element by the arithmetic element 2022 in processing unit 202, row operation of going forward side by side obtains its waveform, become to represent that the digital information of the power of signal is sent in display unit by waveform transformation to show, workmen accurately can judge the position of cable staple shaft according to the power of this signal.
In actual use, can also judge whether have fault point in cable duct according to the digital information obtained, cable duct normally blocks due to the earth of surrounding by fault point, or due to other reason make cable duct be out of shape, flatten, make dredging bars to pass through cable duct.Therefore, when wiring machine dredging bars cannot normal through cable duct time, workmen can locate fault point accurately according to digital signal shown in signal receiving device.
In actual use, the shell of sender unit is the cylindrical or oval sealing shell that discharges water.The sheathing material of sender unit is metal.Like this, just can not affect under the prerequisite that wiring machine dredging bars normally uses, sender unit can normally work, and employing discharges water, sealing shell can also avoid the infringement because sewage or rainwater bring equipment, has stronger survival ability under water.
In actual use, the supply unit of sender unit is configured to detachable chargeable lithium cell, preferably, adopt XC12-1000 rechargeable lithium ion batteries group, compare other rechargeable batteries, there is the advantages such as reliability is high, discharge-rate large, have extended cycle life, energy density is large, volume is little, be applicable to portable set application scenario.
In actual use, conveniently carry in signal receiving device and use, its supply unit is configured to chargeable detachable lithium, and can connect generator employing alternating current or DC power supply as required.
As can be seen from technique scheme, sender unit in the embodiment of the present invention and signal receiving device cooperatively interact, convert the signal into digital information to show intuitively in a display device, accurately can locate the position of cable staple shaft, and can the fault point in cable duct be positioned, substantially increase the operating efficiency of workmen, save the time, decrease economic loss.
For convenience of description, various module is divided into describe respectively with function when describing above system.Certainly, the function of each module can be realized in same or multiple software and/or hardware when implementing of the present invention.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for device or system embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.Apparatus and system embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
Professional can also recognize further, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (9)

1. a device for cable staple shaft location, is characterized in that, comprising: sender unit and signal receiving device;
Described sender unit comprises: signal source generating means and transmitting antenna;
Described transmitting antenna is connected with described signal source generating means, for making the signal wirelessly sending the generation of described signal source generating means;
Described signal receiving device comprises: reception antenna, processing unit and display unit;
Described processing unit is connected with described reception antenna and described display unit respectively, obtains digital information, and output to described display unit for the treatment of after the described signal that described reception antenna receives; Described digital information is used for the position being carried out positioning cable staple shaft by the intensity characterizing described signal.
2. device according to claim 1, is characterized in that, described signal source generating means specifically comprises: signal generation unit, signal processing unit and signal madulation unit;
Described signal generation unit is connected with described signal processing unit, for generating Sine Wave Pulse Width Modulation SPWM signal and being sent to described signal processing unit;
Described signal processing unit is connected with described signal madulation unit, for described SPWM signal being adjusted to the standard sine signal of fixed frequency, and is sent to described signal madulation unit;
Described signal madulation unit is connected with described transmitting antenna, after being modulated by described standard sine signal, send the standard sine signal after modulation by described transmitting antenna.
3. device according to claim 2, is characterized in that, described processing unit specifically comprises: signal demodulation unit, signal computing unit;
Described signal demodulation unit is connected with described reception antenna, carries out rectification, generating solution modulation signal for the standard sine signal after the described modulation that received by described reception antenna;
Described signal computing unit is connected with described signal demodulation unit, obtains digital information, and described digital information is sent to described display unit for carrying out computing to described rectification signal.
4. device according to claim 1, is characterized in that, also comprises audio output device;
Described audio signal also for described signal being converted to the audio signal of the intensity for characterizing described signal, and is sent to described audio output device by described processing unit;
Described audio output device is connected with described processing unit, for exporting described audio signal.
5. device according to claim 1, is characterized in that, also comprises light output device;
Described light signal also for described signal being converted to the light signal of the intensity for characterizing described signal, and is sent to described light output device by described processing unit;
Described light output device is connected with described processing unit, for exporting described light signal.
6. the device according to claim 1 to 5 any one, is characterized in that, the shell of described sender unit is cylindrical or oval water-proof sealing shell.
7. the device according to claim 1 to 5 any one, is characterized in that, the sheathing material of described sender unit is metal.
8. the device according to claim 1 to 5 any one, is characterized in that, the supply unit of described sender unit is detachable chargeable lithium cell.
9. the device according to claim 1 to 5 any one, is characterized in that, the supply unit of described signal receiving device is detachable chargeable lithium cell.
CN201610028400.2A 2016-01-15 2016-01-15 A kind of device of cable staple shaft positioning Active CN105490694B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110635436A (en) * 2019-09-30 2019-12-31 国网上海市电力公司 Compound cable pit

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Publication number Priority date Publication date Assignee Title
JPH03125792A (en) * 1989-10-11 1991-05-29 Nkk Corp Position detection of front end of excavation in underground excavation process
US20070040558A1 (en) * 2004-01-15 2007-02-22 Metrotech Corporation, Inc. Method and apparatus for digital detection of electronic markers using frequency adaptation
US20130226512A1 (en) * 2012-02-23 2013-08-29 Graham Mark McIntyre Magneto-inductive positioning using a rotating magnetic field
CN203522758U (en) * 2013-11-06 2014-04-02 中煤科工集团重庆研究院有限公司 Multi-frequency intelligent mine person-in-distress search instrument based on RF signal capture
CN104683038A (en) * 2015-03-11 2015-06-03 西南科技大学 Data through-the-earth transmission method based on sound waves
CN205283524U (en) * 2016-01-15 2016-06-01 杭州凯达电力建设有限公司 Device of cable blind shaft location

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03125792A (en) * 1989-10-11 1991-05-29 Nkk Corp Position detection of front end of excavation in underground excavation process
US20070040558A1 (en) * 2004-01-15 2007-02-22 Metrotech Corporation, Inc. Method and apparatus for digital detection of electronic markers using frequency adaptation
US20130226512A1 (en) * 2012-02-23 2013-08-29 Graham Mark McIntyre Magneto-inductive positioning using a rotating magnetic field
CN203522758U (en) * 2013-11-06 2014-04-02 中煤科工集团重庆研究院有限公司 Multi-frequency intelligent mine person-in-distress search instrument based on RF signal capture
CN104683038A (en) * 2015-03-11 2015-06-03 西南科技大学 Data through-the-earth transmission method based on sound waves
CN205283524U (en) * 2016-01-15 2016-06-01 杭州凯达电力建设有限公司 Device of cable blind shaft location

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110635436A (en) * 2019-09-30 2019-12-31 国网上海市电力公司 Compound cable pit

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